dwctl 8.44.1

//! Fusillade-backed implementation of onwards' `ResponseStore` trait
//! and standalone functions for creating/completing response records.
//!
//! All fusillade operations go through the `Storage` trait via `request_manager`.
//! The only raw SQL is the `api_keys` lookup which queries a dwctl-owned table.

use std::sync::Arc;

use async_trait::async_trait;
use fusillade::{BatchInput, PostgresRequestManager, RequestId, RequestTemplateInput, ReqwestHttpClient, Storage};
use onwards::{ResponseStore, StoreError};
use sqlx_pool_router::PoolProvider;
use uuid::Uuid;

/// Header set by the responses middleware so the outlet handler knows which
/// fusillade row to update with the response body.
pub const ONWARDS_RESPONSE_ID_HEADER: &str = "x-onwards-response-id";

/// A fusillade daemon ID assigned to this onwards instance.
#[derive(Debug, Clone, Copy)]
pub struct OnwardsDaemonId(pub Uuid);

/// ResponseStore implementation backed by fusillade's `Storage` trait.
pub struct FusilladeResponseStore<P: PoolProvider + Clone> {
    request_manager: Arc<PostgresRequestManager<P, ReqwestHttpClient>>,
}

impl<P: PoolProvider + Clone> FusilladeResponseStore<P> {
    pub fn new(request_manager: Arc<PostgresRequestManager<P, ReqwestHttpClient>>) -> Self {
        Self { request_manager }
    }

    /// Retrieve a response by ID. Used by the GET /v1/responses/{id} handler.
    pub async fn get_response(&self, response_id: &str) -> Result<Option<serde_json::Value>, StoreError> {
        let id = parse_response_id(response_id)?;

        match self.request_manager.get_request_detail(RequestId(id)).await {
            Ok(detail) => Ok(Some(detail_to_response_object(&detail))),
            Err(fusillade::FusilladeError::RequestNotFound(_)) => Ok(None),
            Err(e) => Err(StoreError::StorageError(format!("Failed to fetch request: {e}"))),
        }
    }
}

/// Mark a response as failed.
pub async fn fail_response<P: PoolProvider + Clone>(
    request_manager: &PostgresRequestManager<P, ReqwestHttpClient>,
    response_id: &str,
    error: &str,
) -> Result<(), StoreError> {
    let id = parse_response_id(response_id)?;

    request_manager
        .fail_request(RequestId(id), error)
        .await
        .map_err(|e| StoreError::StorageError(format!("Failed to fail request: {e}")))?;

    Ok(())
}

/// Returns true if a fusillade request with this id already exists.
///
/// Used by `create-response` to skip work when `complete-response` has already
/// raced ahead and inserted the row itself.
pub async fn request_exists<P: PoolProvider + Clone>(
    request_manager: &PostgresRequestManager<P, ReqwestHttpClient>,
    request_id: Uuid,
) -> Result<bool, StoreError> {
    match request_manager.get_request_detail(RequestId(request_id)).await {
        Ok(_) => Ok(true),
        Err(fusillade::FusilladeError::RequestNotFound(_)) => Ok(false),
        Err(e) => Err(StoreError::StorageError(format!("Failed to check request existence: {e}"))),
    }
}

/// Context required to create a fusillade single-request batch.
///
/// Carried by `complete-response` so it can create-then-complete when it
/// races ahead of `create-response`.
pub struct CreateContext<'a> {
    pub batch_id: Uuid,
    pub request_id: Uuid,
    pub request_body: &'a str,
    pub model: &'a str,
    pub endpoint: &'a str,
    pub base_url: &'a str,
    pub api_key: Option<&'a str>,
}

/// Mark a response as completed, creating the row first if it doesn't exist.
///
/// The two-job lifecycle (create-response, complete-response) can race —
/// they're enqueued within ~50ms of each other and run on independent
/// underway queues. This helper tolerates either ordering: if the UPDATE
/// finds nothing, we synthesize the row with the supplied context and
/// retry the UPDATE.
pub async fn complete_response_idempotent<P: PoolProvider + Clone>(
    request_manager: &PostgresRequestManager<P, ReqwestHttpClient>,
    dwctl_pool: &sqlx::PgPool,
    response_id: &str,
    response_body: &str,
    status_code: u16,
    create_ctx: CreateContext<'_>,
) -> Result<(), StoreError> {
    let id = parse_response_id(response_id)?;

    match request_manager.complete_request(RequestId(id), response_body, status_code).await {
        Ok(()) => Ok(()),
        Err(fusillade::FusilladeError::RequestNotFound(_)) => {
            // create-response hasn't run yet (or failed). Synthesize the row.
            // create-response may also be racing us — if it wins between our
            // failed UPDATE and our INSERT, the INSERT will hit a PK conflict.
            // Treat that as "create-response got there first" and just retry
            // the UPDATE.
            tracing::info!(
                response_id = %response_id,
                model = %create_ctx.model,
                endpoint = %create_ctx.endpoint,
                "complete-response synthesizing row (create-response hasn't run yet)"
            );
            if create_ctx.endpoint.is_empty() {
                // We'd create a row with an empty endpoint — that's broken
                // upstream (responses middleware should always set the
                // x-onwards-endpoint header). Better to fail loudly than
                // silently insert a row that's hard to find later.
                return Err(StoreError::StorageError(
                    "Cannot synthesize request row: empty endpoint in CreateContext (x-onwards-endpoint header missing upstream)".into(),
                ));
            }
            let created_by = lookup_created_by(dwctl_pool, create_ctx.api_key).await;
            let batch_input = fusillade::CreateSingleRequestBatchInput {
                batch_id: Some(create_ctx.batch_id),
                request_id: create_ctx.request_id,
                body: create_ctx.request_body.to_string(),
                model: create_ctx.model.to_string(),
                base_url: create_ctx.base_url.to_string(),
                endpoint: create_ctx.endpoint.to_string(),
                completion_window: "0s".to_string(),
                initial_state: "processing".to_string(),
                api_key: create_ctx.api_key.map(String::from),
                created_by,
            };
            match request_manager.create_single_request_batch(batch_input).await {
                Ok(_) => {
                    tracing::info!(
                        response_id = %response_id,
                        "Synthetic create from complete-response succeeded — row now exists in 'processing'"
                    );
                }
                Err(e) => {
                    // Don't fail loudly here — the next UPDATE attempt is the
                    // ground truth. If the row exists (we lost the race to
                    // create), UPDATE will succeed.
                    tracing::info!(
                        response_id = %response_id,
                        error = %e,
                        "Synthetic create from complete-response failed (likely create-response won the race) — proceeding to UPDATE"
                    );
                }
            }

            match request_manager.complete_request(RequestId(id), response_body, status_code).await {
                Ok(()) => {
                    tracing::info!(response_id = %response_id, "Second-attempt UPDATE succeeded — row now 'completed'");
                    Ok(())
                }
                Err(e) => {
                    tracing::warn!(response_id = %response_id, error = %e, "Second-attempt UPDATE failed");
                    Err(StoreError::StorageError(format!("Failed to complete after create: {e}")))
                }
            }
        }
        Err(e) => Err(StoreError::StorageError(format!("Failed to complete request: {e}"))),
    }
}

/// Poll a fusillade request until it reaches a terminal state (completed/failed/canceled).
pub async fn poll_until_complete<P: PoolProvider + Clone>(
    request_manager: &PostgresRequestManager<P, ReqwestHttpClient>,
    response_id: &str,
    poll_interval: std::time::Duration,
    timeout: std::time::Duration,
) -> Result<serde_json::Value, StoreError> {
    let id = parse_response_id(response_id)?;
    let start = std::time::Instant::now();

    loop {
        match request_manager.get_request_detail(RequestId(id)).await {
            Ok(detail) => match detail.status.as_str() {
                "completed" | "failed" | "canceled" => {
                    return Ok(detail_to_response_object(&detail));
                }
                _ => {}
            },
            Err(fusillade::FusilladeError::RequestNotFound(_)) => {}
            Err(e) => {
                return Err(StoreError::StorageError(format!("Failed to poll request: {e}")));
            }
        }

        if start.elapsed() >= timeout {
            return Err(StoreError::StorageError(format!(
                "Timeout waiting for request {response_id} to complete after {:?}",
                timeout
            )));
        }

        tokio::time::sleep(poll_interval).await;
    }
}

/// Look up the user ID from an API key for batch/response attribution.
///
/// Returns `Some(user_id)` if the key is found, `None` otherwise.
pub async fn lookup_created_by(pool: &sqlx::PgPool, api_key: Option<&str>) -> Option<String> {
    let key = api_key?;
    match sqlx::query("SELECT user_id FROM public.api_keys WHERE secret = $1 AND is_deleted = false LIMIT 1")
        .bind(key)
        .fetch_optional(pool)
        .await
    {
        Ok(Some(row)) => {
            use sqlx::Row;
            let user_id: Uuid = row.get("user_id");
            Some(user_id.to_string())
        }
        Ok(None) => {
            tracing::warn!(key_prefix = &key[..8.min(key.len())], "API key not found for attribution");
            None
        }
        Err(e) => {
            tracing::error!(error = %e, "Failed to look up API key for attribution");
            None
        }
    }
}

/// Create a batch of 1 in fusillade for async/flex processing.
///
/// Uses fusillade's `create_file` + `create_batch` methods.
/// The fusillade daemon will pick up the pending request and process it.
///
/// Returns `(response_id, request_id)` where response_id is `resp_<uuid>`.
pub async fn create_batch_of_1<P: PoolProvider + Clone>(
    request_manager: &PostgresRequestManager<P, ReqwestHttpClient>,
    request: &serde_json::Value,
    model: &str,
    base_url: &str,
    path: &str,
    completion_window: &str,
    api_key: Option<&str>,
) -> Result<(String, Uuid), StoreError> {
    let pool = request_manager.pool();
    let body = request.to_string();

    let created_by = lookup_created_by(pool, api_key).await.unwrap_or_default();

    let template = RequestTemplateInput {
        custom_id: None,
        endpoint: base_url.to_string(),
        method: "POST".to_string(),
        path: path.to_string(),
        body,
        model: model.to_string(),
        api_key: String::new(),
    };

    let file_id = request_manager
        .create_file("responses_api_single".into(), None, vec![template])
        .await
        .map_err(|e| StoreError::StorageError(format!("Failed to create file: {e}")))?;

    let batch = request_manager
        .create_batch(BatchInput {
            file_id,
            endpoint: path.to_string(),
            completion_window: completion_window.to_string(),
            metadata: None,
            created_by: if created_by.is_empty() { None } else { Some(created_by) },
            api_key_id: None,
            api_key: api_key.map(|s| s.to_string()),
            total_requests: Some(1),
        })
        .await
        .map_err(|e| StoreError::StorageError(format!("Failed to create batch: {e}")))?;

    let requests = request_manager
        .get_batch_requests(batch.id)
        .await
        .map_err(|e| StoreError::StorageError(format!("Failed to get batch requests: {e}")))?;

    let request_id = requests
        .first()
        .map(|r| *r.id())
        .ok_or_else(|| StoreError::StorageError("Batch created with no requests".into()))?;

    let response_id = format!("resp_{request_id}");
    tracing::debug!(
        response_id = %response_id,
        batch_id = %batch.id,
        completion_window = %completion_window,
        "Created batch of 1 for async processing"
    );

    Ok((response_id, request_id))
}

/// Parse a response ID like "resp_<uuid>" into a UUID.
fn parse_response_id(response_id: &str) -> Result<Uuid, StoreError> {
    let uuid_str = response_id.strip_prefix("resp_").unwrap_or(response_id);
    Uuid::parse_str(uuid_str).map_err(|e| StoreError::NotFound(format!("Invalid response ID: {e}")))
}

/// Map a fusillade request state to an Open Responses API status.
fn state_to_status(state: &str) -> &'static str {
    match state {
        "pending" => "queued",
        "claimed" | "processing" => "in_progress",
        "completed" => "completed",
        "failed" => "failed",
        "canceled" => "cancelled",
        _ => "failed",
    }
}

/// Convert a `RequestDetail` into an Open Responses API Response object.
fn detail_to_response_object(detail: &fusillade::RequestDetail) -> serde_json::Value {
    let status = state_to_status(&detail.status);

    // Derive background from the stored request body if available.
    let background = detail
        .body
        .as_deref()
        .and_then(|b| serde_json::from_str::<serde_json::Value>(b).ok())
        .and_then(|v| v.get("background")?.as_bool())
        .unwrap_or(false);

    let mut resp = serde_json::json!({
        "id": format!("resp_{}", detail.id),
        "object": "response",
        "created_at": detail.created_at.timestamp(),
        "status": status,
        "model": detail.model,
        "background": background,
        "output": [],
    });

    if status == "completed" {
        if let Some(ref body) = detail.response_body
            && let Ok(parsed) = serde_json::from_str::<serde_json::Value>(body)
        {
            if let Some(output) = parsed.get("output") {
                resp["output"] = output.clone();
            }
            if let Some(usage) = parsed.get("usage") {
                resp["usage"] = usage.clone();
            }
            // ChatCompletion format (batch results)
            if parsed.get("choices").is_some() {
                resp["output"] = serde_json::json!([{
                    "type": "message",
                    "role": "assistant",
                    "content": parsed
                }]);
            }
        }
        resp["completed_at"] = serde_json::json!(detail.completed_at.map(|t| t.timestamp()));
    }

    if status == "failed"
        && let Some(ref err) = detail.error
    {
        resp["error"] = serde_json::json!({
            "type": "server_error",
            "message": err,
        });
    }

    resp
}

#[async_trait]
impl<P: PoolProvider + Clone + Send + Sync + 'static> ResponseStore for FusilladeResponseStore<P> {
    async fn store(&self, response: &serde_json::Value) -> Result<String, StoreError> {
        let id = response.get("id").and_then(|v| v.as_str()).unwrap_or("").to_string();
        Ok(id)
    }

    async fn get_context(&self, response_id: &str) -> Result<Option<serde_json::Value>, StoreError> {
        self.get_response(response_id).await
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn test_parse_response_id_with_prefix() {
        let uuid = Uuid::new_v4();
        let id = format!("resp_{uuid}");
        let parsed = parse_response_id(&id).unwrap();
        assert_eq!(parsed, uuid);
    }

    #[test]
    fn test_parse_response_id_without_prefix() {
        let uuid = Uuid::new_v4();
        let parsed = parse_response_id(&uuid.to_string()).unwrap();
        assert_eq!(parsed, uuid);
    }

    #[test]
    fn test_parse_response_id_invalid() {
        let result = parse_response_id("not-a-uuid");
        assert!(result.is_err());
        assert!(matches!(result, Err(StoreError::NotFound(_))));
    }

    #[test]
    fn test_state_to_status_mapping() {
        assert_eq!(state_to_status("pending"), "queued");
        assert_eq!(state_to_status("claimed"), "in_progress");
        assert_eq!(state_to_status("processing"), "in_progress");
        assert_eq!(state_to_status("completed"), "completed");
        assert_eq!(state_to_status("failed"), "failed");
        assert_eq!(state_to_status("canceled"), "cancelled");
        assert_eq!(state_to_status("unknown"), "failed");
    }

    #[test]
    fn test_store_extracts_id_from_response() {
        let response = serde_json::json!({
            "id": "resp_12345678-1234-1234-1234-123456789abc",
            "status": "completed",
        });
        let id = response.get("id").and_then(|v| v.as_str()).unwrap_or("");
        assert_eq!(id, "resp_12345678-1234-1234-1234-123456789abc");
    }

    #[test]
    fn test_store_handles_missing_id() {
        let response = serde_json::json!({"status": "completed"});
        let id = response.get("id").and_then(|v| v.as_str()).unwrap_or("");
        assert_eq!(id, "");
    }
}